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Full‐Scale Ozone–Biofiltration: Seasonally Related Effects on NOM Removal
Author(s) -
Pharand Lizanne,
Van Dyke Michele I.,
Anderson William B.,
Yohannes Yonatan,
Huck Peter M.
Publication year - 2015
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.5942/jawwa.2015.107.0121
Subject(s) - biofilter , chemistry , ozone , environmental chemistry , organic matter , total organic carbon , dissolved organic carbon , biomass (ecology) , water treatment , natural organic matter , carbon fibers , environmental engineering , organic chemistry , environmental science , ecology , biology , materials science , composite number , composite material
Performance of full‐scale ozone–biofiltration was investigated over 14 months to determine the potential effects of seasonally related changes in water temperature and quality on the removal of natural organic matter fractions. The biofilters removed on average 12% of dissolved organic carbon, 31% of biopolymers, 6% of humic substances, 10% of humic building blocks, 31% of low‐molecular‐weight (LMW) acids/LMW humics, 14% of LMW neutrals, and 52% of assimilable organic carbon. The biofilters exhibited an increase in removal of dissolved organic carbon, biopolymers, LMW acids/LMW humics, and assimilable organic carbon as temperature increased from 3 to 28°C, even though filter contact time was somewhat shorter at higher temperatures. Although phosphorus concentrations were reduced by coagulation pretreatment, the biofilters effectively removed the LMW compounds generated from ozonation. Filter biomass levels were not related to temperature, empty bed contact time, time during the filter cycle, or removal of natural organic matter.